Malcolm Turnbull is facing a 10 per cent swing against him in his Sydney seat of Wentworth, according to polling that shows more than half his local electors think less of him since he became Prime Minister.

The ReachTel poll conducted across the blue-ribbon Liberal electorate last week suggests Mr Turnbull's first preference vote will be slashed from 63 per cent to 53 per cent.

His lead in the two-party preferred stakes will be similarly reduced from the 2013 result of 68-32 to 58-42.

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While he will still be comfortably re-elected with such a result, it will be the first swing against him since he first won the seat in 2004. He increased his margin at the 2007, 2010 and 2013 elections.

Prime Minister Malcolm Turnbull's popularity in his electorate of Wentworth has fallen.Credit:Andrew Meares

The polling underscores just how much his popularity has waned since he took over the nation's top job last year.

The poll, commissioned by the Labor candidate, wealthy art dealer Evan Hughes, finds 55.6 per cent of Wentworth voters report that their opinion of Mr Turnbull has declined since September.

His standing with both men and women and across all age groups has diminished, the polling shows.

Only 14.5 per cent of people say their opinion of him has improved. About 30 per cent say their opinion is unchanged.

Evan Hughes is running for the seat of Wentworth against Prime Minister Malcolm Turnbull. Credit:James Brickwood

Almost 35 per cent of Liberal voters have cooled on him, while almost 80 per cent of Labor voters and close to 90 per cent of Greens voters say their opinion of him has diminished.

More than 53 per cent of respondents say Mr Turnbull has failed to live up to their expectations. Men and the over-50s are the most likely to be disappointed with his performance.

The polling comes a day after the latest Fairfax-Ipsos poll puts Labor ahead of the Coalition for the first time on 51-49. It also shows Mr Turnbull's personal approval rating continuing to slide.